SomberNight d7af868ed8 network: test if interface is alive before iface.taskgroup.spawn ...

closes https://github.com/spesmilo/electrum/issues/7677

```
 E/n | network | taskgroup died.
 Traceback (most recent call last):
   File "/opt/electrum/electrum/network.py", line 1204, in main
     [await group.spawn(job) for job in self._jobs]
   File "/home/voegtlin/.local/lib/python3.8/site-packages/aiorpcx/curio.py", line 297, in __aexit__
     await self.join()
   File "/opt/electrum/electrum/util.py", line 1255, in join
     task.result()
   File "/opt/electrum/electrum/network.py", line 1277, in _maintain_sessions
     await maintain_main_interface()
   File "/opt/electrum/electrum/network.py", line 1268, in maintain_main_interface
     await self._ensure_there_is_a_main_interface()
   File "/opt/electrum/electrum/network.py", line 1245, in _ensure_there_is_a_main_interface
     await self._switch_to_random_interface()
   File "/opt/electrum/electrum/network.py", line 648, in _switch_to_random_interface
     await self.switch_to_interface(random.choice(servers))
   File "/opt/electrum/electrum/network.py", line 714, in switch_to_interface
     await i.taskgroup.spawn(self._request_server_info(i))
   File "/home/voegtlin/.local/lib/python3.8/site-packages/aiorpcx/curio.py", line 204, in spawn
     self._add_task(task)
   File "/home/voegtlin/.local/lib/python3.8/site-packages/aiorpcx/curio.py", line 150, in _add_task
     raise RuntimeError('task group terminated')
 RuntimeError: task group terminated
```

I believe the "suppress spurious cancellations" block was added as SilentTaskGroup raised
CancelledError instead of RuntimeError for this scenario.

2022-02-21 20:09:26 +01:00

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